TY - JOUR
T1 - Nerve growth factor pretreatment attenuates oxygen and glucose deprivation-induced c-Jun amino-terminal kinase 1 and stress-activated kinases p38α and p38β activation and confers neuroprotection in the pheochromocytoma PC12 model
AU - Tabakman, Rinat
AU - Jiang, Hao
AU - Schaefer, Erik
AU - Levine, Robert A.
AU - Lazarovici, Philip
PY - 2004/3
Y1 - 2004/3
N2 - Neurotrophins such as nerve growth factor (NGF) are considered putative neuroprotective compounds in the central nervous system. To investigate the cellular and molecular neuroprotective mechanisms of NGF under ischemia, we used a unique oxygen and glucose deprivation (OGD) device. In this system we used pheochromocytoma PC12 cells to elucidate NGF neuroprotective effect. PC12 cells were exposed to OGD, followed by addition of glucose and oxygen (OGD reperfusion). Neuronal cell death induced in this model was measured by the release of lactate dehydrogenase (LDH), activation of caspase-3 and mitogen-activated protein kinases (MAPKs), measured with specific anti-phospho-antibodies. Pretreatment of the cultures with 50 ng/mL NGF, 18 h prior to OGD insult, conferred 30% neuroprotection. However, treatment of the cultures with NGF concomitantly with the OGD insult did not result in neuroprotection. Time-course experiments showed marked activation of extracellular signal-regulated protein kinase, c-Jun N-terminal kinase (JNK), and p38 MAPK isoforms during the OGD phase but not during OGD reperfusion. Pretreatment of the cultures with 50 ng/mL NGF, 18 h prior to OGD insult, resulted in 50% attenuation of OGD-induced activation of JNK1, and 20% and 50% attenuation of OGD-induced activation of p38α and β, respectively. These findings support the notion that NGF confers neuroprotection from OGD insult, a phenomenon coincidentally related to differential inhibition of MAPK stress kinase isof orms, and provide the PC12 model as an in vitro OGD system to investigate molecular mechanisms of neurotoxicity and neuroprotection.
AB - Neurotrophins such as nerve growth factor (NGF) are considered putative neuroprotective compounds in the central nervous system. To investigate the cellular and molecular neuroprotective mechanisms of NGF under ischemia, we used a unique oxygen and glucose deprivation (OGD) device. In this system we used pheochromocytoma PC12 cells to elucidate NGF neuroprotective effect. PC12 cells were exposed to OGD, followed by addition of glucose and oxygen (OGD reperfusion). Neuronal cell death induced in this model was measured by the release of lactate dehydrogenase (LDH), activation of caspase-3 and mitogen-activated protein kinases (MAPKs), measured with specific anti-phospho-antibodies. Pretreatment of the cultures with 50 ng/mL NGF, 18 h prior to OGD insult, conferred 30% neuroprotection. However, treatment of the cultures with NGF concomitantly with the OGD insult did not result in neuroprotection. Time-course experiments showed marked activation of extracellular signal-regulated protein kinase, c-Jun N-terminal kinase (JNK), and p38 MAPK isoforms during the OGD phase but not during OGD reperfusion. Pretreatment of the cultures with 50 ng/mL NGF, 18 h prior to OGD insult, resulted in 50% attenuation of OGD-induced activation of JNK1, and 20% and 50% attenuation of OGD-induced activation of p38α and β, respectively. These findings support the notion that NGF confers neuroprotection from OGD insult, a phenomenon coincidentally related to differential inhibition of MAPK stress kinase isof orms, and provide the PC12 model as an in vitro OGD system to investigate molecular mechanisms of neurotoxicity and neuroprotection.
KW - Cell death
KW - JNK1
KW - MAPK
KW - Neuroprotection
KW - NGF
KW - OGD
KW - P38α/β
KW - PC12
UR - http://www.scopus.com/inward/record.url?scp=2942514365&partnerID=8YFLogxK
U2 - 10.1385/JMN:22:3:237
DO - 10.1385/JMN:22:3:237
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C2 - 14997018
AN - SCOPUS:2942514365
SN - 0895-8696
VL - 22
SP - 237
EP - 249
JO - Journal of Molecular Neuroscience
JF - Journal of Molecular Neuroscience
IS - 3
ER -